Improvement in steam-gages



DONALDSON a QUINN.

Steam Gage.

No. 66,311. Patented Juiy 2', 1867.

UNTTED STATES PATENT OFFICE.

noDEET n. DONALDSON AND EMMETT QUTNN, or WAsHrNeToN, D. c.

INI PIROVEM ENT IN ST-EAM-GAGES.

Speciiieation forming part of Letters Patent No. 66,311, dated nly 2, 1867.

To all whom it 'may concern:

Beit known that we'RoBERT B. DONALD- soN and EMMETT QUINN, of Washington city, in the District of Columbia, have invented a new and 'useful Improvement in the Manufacture of Compound Siphon Steam-Gages, invented by Emmett Quinn, and patented by him March 13, 1866, and March 12, 1867; and we do hereby declare the following is a full, clear, and exact description oi' the construction and operation of the same, reference being had to the accompanying drawings, in which- Figure 1 is a frontview. Fig. 2 is a vertical section.

Like letters in the figures of the drawings indicate like parts.

The nature of our invention and improvement consists in the application and use of india-rubber, gutta-percha, or their compounds,

- or any other suitable material, in the manufacture of steam-gages.

To enable others skilled in the art to make and use our invention, we will proceed to describe its construction and operation.

Letter A is a tubular column, composed of india-rubber, gutta-percha, or their compounds,

or other suitable material, of proper size, and molded or carved in a neat shape and style. B B are tubular pipes, of proper diameters, eX- tending through the entire length of the column A, and answer the place and purpose of the metallic siphons or tubes heretofore used in suchsteam-gages. Tliesetubular pipes may be molded with and in the column A around metallic cores, which may consist either of thin tubes supported on mandrels, or around smooth, straight metallic rods, prepared and arranged for that purpose, at proper distances apart, and parallel, so that the partitions betweenand the outside walls of the tubular .pipes will be of suilicient thickness to afford the required strength, the mandrels or rods to be withdrawn when the molding is complete; or the column A may be molded solid, and the holes may be drilled. (See Figs. 3 and 4, which represent the hollow cores with the `mandrels withdrawn, Fig. 2 representing the tubes with the solid cores or rods withdrawn.)

Communication between each of the tubular pipes is effected by the grooves h h at alternate ends, substantially theA same as in the patent referred to.

closed by proper packing `under the metallic caps G G,tightlyfastened on'the ends of column A by means of the screws DD and the metallic nuts 'E E, so as to entirely prevent the escaping of the iluids.

To guard against and prevent any injurious effects of heated steam coming directly in contact with the rubber or gutta-percha, a metallic tube, H, of proper size and length, and

The ends of the tubular holes arel securely I properly constructedto connect with the steampipe, is placed or molded into the rst tubular pipe, and receives the direct pressure and ei'ects of the steam, communicating the pressure 'to the other tubular holesthrough the grooves h It.

A suitable scale, F, and glass tube Gr,

with-an elastic reservoir, for vthe purpose ofadjusting the level of the mercury to the zeropoint in the index-tube, as shown in the patent referred to, are arranged upon and in the front of the gage, so as to indicate the exact pressure of the steam. A supplementary elastic reservoir may also. be applied to the central tubeof the gage, to more eii'ectually accomplish what is now, in a great measure, d one by the one attached to the index-tube, as shown in the patent above referred to.

The rubber gage thus constructed can be manufactured with much greater facility, in a neatcr style, at much less expense, and will be much lighter than the metallic steam-gages.

Having thus fully described our invention, what we claim therein as new, and desire to.

secure by Letters Patent, is-

1. The construction of tubes for steam-gages of india-rubber, gutta-pcrcha, or their compounds, or other suitable material, substantially in the. manner and for the purposes as herein set forth. v

2. The construction of hollow cores of metal, or other suitable material, supported by mandrels, substantially in the manner and for the purposes as herein set forth.

1R. B. DONALDSON.

EMMETT QUNN.

Witnesses:

EDM. F. BROWN, W. BURRIS. 

